. Journal of roentgenology . Tube No. 1. Made by W. J. Boehm, in Chicago, early in 1896. Probablythe first Eoentgen Eay tube made in the United States. Tube No. 2. Made by Heinz Bauer and brought to this country early in1896. Probably the first Eoentgen Eay tube in this country with vacuumcontrol. Tube No. 3. Made by Gundelach in 1895 and brought to this country earlyin 1896. HOLINGER —X-RAY HISTORY 431. Tube No. 4. Made by the Algemeine Electricitats Gesellschaft in 1895 andbrought to this country in 1896. This is the first tube to take on the outwardform of the modern gas tube. 432 THE JOURN
. Journal of roentgenology . Tube No. 1. Made by W. J. Boehm, in Chicago, early in 1896. Probablythe first Eoentgen Eay tube made in the United States. Tube No. 2. Made by Heinz Bauer and brought to this country early in1896. Probably the first Eoentgen Eay tube in this country with vacuumcontrol. Tube No. 3. Made by Gundelach in 1895 and brought to this country earlyin 1896. HOLINGER —X-RAY HISTORY 431. Tube No. 4. Made by the Algemeine Electricitats Gesellschaft in 1895 andbrought to this country in 1896. This is the first tube to take on the outwardform of the modern gas tube. 432 THE JOURNAL OF ROENTGENOLOGY THE USE OF THE PLATE SHIELD AS A CHECKIN DARK ROOM WORK The plate shield consists of a rectangular sheet of leadfrom 1-16 to 1-8 of an inch thick, 8% inches wide by lO1/^inches long, with a circular hole cut in the center 7 inchesin diameter. This size shield is intended to be used with8x10 plates and the advantage of having it % inch largerwill be at once apparent when using it with plates loaded ineither envelopes or cassettes. The purpose of the shield isto provide a simple, easy and frequent check upon the con-dition of the plates and developing and fixing solutionsthat are being used. If a plate, in good condition, be removed from the orig-inal package and carried through the developing processwith the solutions in prime condition and at the propertemperature, the emulsio
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Keywords: ., bookcentury1900, bookdecade1910, bookidjour, booksubjectradiology
